JPH0641469Y2 - Device for attaching drawing board frame of drafting table - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a drawing board frame mounting device for a drawing board, and more particularly, to mounting a drawing board frame for a drawing board in which the rotation range of the drawing board is restricted. It relates to the device.

[Prior Art] Conventionally, a drawing board is formed in such a manner that a drawing board frame is pivotally attached to an upper end portion of an elevating column in a vertically rotatable manner and can be fixed at an arbitrary inclination angle by an inclination adjusting device.

[Problems to be solved by the invention] Normally, the inclination angle of the drawing board installed on the drafting table is about 70 to 80 degrees which is almost vertical from the horizontal state,
It is unthinkable to use beyond this range. However,
Since the drawing board frame is pivotally attached to the movable supporting column, for example, when the drawing board is set in a horizontal state, when the drawing board is rotated beyond the horizontal state to a state of a reverse inclination with respect to the operator. There is. Therefore, the operator must operate the tilt adjusting device while holding the drawing board and the drawing board frame horizontally, which is a problem in workability.

Therefore, there is a technical problem to be solved in order to prevent the drawing board frame from rotating beyond a predetermined use angle range and improve workability, and the present invention solves the problem. The purpose is to

[Means for Solving the Problems] This invention has been proposed in order to achieve the above-mentioned object, and is a fixed support column 3 standing on the base 2, and the fixed support column 3.
It is composed of a movable support column 4 which is loosely inserted into and is movable up and down, and a drawing plate frame 5, and a mounting bracket 16 is fixedly installed on one of the movable supporting column 4 or the drawing plate frame 5, and the mounting plate 16 is used to attach the mounting bracket 16. In the drafting table 1 in which the frame 5 is pivotally attached to the movable column 4, one end of the mounting bracket 16 is bent to provide a rotation restricting portion 21.
When the drawing board frame 5 is at a predetermined angle, the rotation restricting portion
A drawing board frame mounting device for a drafting table is provided, in which 21 is formed so as to abut on a pivotally mounted member of the mounting bracket 16 so as to restrict the rotation range of the drawing board frame 5. .

[Operation] The drawing board frame and the movable support are pivotally attached via a mounting bracket. One end of the mounting bracket is bent to form a rotation restricting portion, and when the mounting bracket is rotated with respect to the pivotally mounted member, the rotation restricting portion reaches a predetermined angle. Is abutted against the pivotally mounted member and its rotation is restricted. For example, if the mounting bracket is fixed to the drawing board frame so that the movable support pillar is the pivotally attached side, and the rotation restricting portion abuts the movable supporting pillar when the drawing board frame is in the horizontal state, The plate frame is prevented from rotating in the reverse inclination direction beyond the horizontal state.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the attached drawings. For convenience of description, technical matters that are conventionally known will be described at the same time. Fig. 1 shows the back of the drafting stand 1, 2,2
Is a base, 3 and 3 are fixed struts standing on the bases 2 and 2, 4 and 4 are movable struts that are loosely inserted into the upper end openings of the fixed struts 3 and 3, and 5 is to the movable struts 4 and 4. It is a picture frame that is pivotally attached. Further, 6 and 7 are reinforcing stays that connect the left and right fixed columns 3 and 3. A brake shaft 8 is housed in the upper supply stay 6, and both end portions of the brake shaft 8 project outward, and 2 are respectively provided at the projecting portions.
The brake plates 9,9,9,9 are loosely inserted. A retaining piece 10 is attached to the left end in FIG. 1, and a handle grip 11 is screwed to the right end. Incidentally, numeral 12 is an air spring for preventing a sudden rotation of the drawing board frame 5.

The left and right members 13 and 13 constituting the drawing board frame 5 are pivoted at one end of the adjustment stays 14 and 14 slightly forward of the middle portion (to the left in FIG. 2). The intermediate portion is sandwiched between the brake plates 9, 9, 9, 9. When the handle grip 11 is rotated in the tightening direction and tightened, the brake plates 9, 9, 9 and 9 are pressed against each other by the retaining piece 10 and the handle grip 11 shown in FIG. 14 is clamped to prevent rotation of the drawing board frame 5. On the other hand, if the handle grip 11 is turned in the direction opposite to the tightening direction to loosen it, the adjustment stay 1
4,14 are guide grooves 15,15,15,15 provided on the brake plates 9,9,9,9
The drawing board frame 5 can be slid along the drawing board frame 5, and can be rotated at an arbitrary angle.

In the drawing board frame 5, mounting brackets 16, 16 are fixedly installed at intermediate portions of the left and right members 13, 13, respectively.
It is pivotally attached to the upper part of the movable columns 4, 4 via. As shown in FIG. 3, the mounting brackets 16 and 16 are formed by pressing a metal plate into a U shape so as to sandwich the left and right sides of the movable support columns 4 and 4. Then, the movable columns 4, 4 and the mounting brackets 16, 16 are formed with through holes 17, 17 in the left-right direction, respectively.
Align 18,18 and insert pins 19,19, C ring 20,20
Alternatively, the drawing board frame 5 can be rotated by fixing the pins 19 and 19 by a locking means such as a nut.

The mounting bracket 16 is provided with rotation restricting portions 21, 21 which are bent inward from the middle portion of the lower ends of the left and right sides to the rear portion by press working. The rotation restricting portions 21 and 21 are formed so as to abut against the back surface of the movable support columns 4 and 4 when the mounting brackets 16 and 16 are in an upright state as shown in FIG. Therefore, as shown in FIG. 2, when the drawing board frame 5 is horizontal, the rotation restricting portions 21, 21, 21, 21 are movable pillars 4, 4.
Since the mounting brackets 16 and 16 are prevented from rotating rearward (to the right in the drawing), the drawing board frame 5 does not exceed the horizontal state and is reversely inclined.

Further, as shown in FIG. 3, through holes 22, 22 are opened in the left and right directions rearward of the pivotally mounted through holes 17, 17 of the mounting bracket 16, and the rotation restricting pin 23 is inserted into the through holes 22, 22. If the drawing frame 5 is tilted forward as shown in FIG. 4, the rotation restricting pins 23, 23 come into contact with the rear parts of the movable support columns 4, 4 by inserting
The rotation of the drawing board frame 5 is stopped. This rotation stop angle can be variously set depending on the opening position of the through holes 22, 22, 22, 22. Although not shown, the rotation regulating pin 2
Instead of 3,23, the regulation portion may be formed by the same bending process as the rotation regulation portions 21,21 described above.

The present invention should not be limited to the above-mentioned embodiment, but the mounting brackets 16 and 16 are fixed to the movable columns 4 and 4, and the drawing frame 5 is pivotally attached to the mounting brackets 16 and 16, It is possible to make various modifications such as a configuration opposite to that of the above-mentioned one embodiment, and it is natural that the present invention covers such modifications.

[Advantages of the Invention] As described in detail in the above-described one embodiment, this invention stops the rotation by the rotation restricting portion when the drawing frame is rotated to a predetermined angle, so that it stops in a horizontal state, for example. By setting the rotation restricting portion so that the operator does not need to operate the tilt adjusting device while holding the drawing board and maintaining it in a horizontal state, workability is improved. Further, it is possible to prevent an unexpected situation in which the drawing board frame unintentionally rotates beyond the normal range of use and is in a reverse tilt or inverted state. Further, the rotation restricting portion can be easily formed by press working or the like, does not require a separate part, does not increase the cost, and is a practically valuable device capable of easily improving the operability.

[Brief description of drawings]

1 and 2 show a drafting table, FIG. 1 is a rear view, FIG. 2 is a side view, FIG. 3 is an exploded perspective view of essential parts, and FIG. 4 is a side view of essential parts. 1 ... Drafting table 2 ... Base 3 ... Fixed support 4 ... Movable support 5 ... Drawing board frame 16 ... Mounting bracket 21 ... Rotation restriction part

Claims (1)

[Scope of utility model registration request] Claims: 1. A fixed column 3 standing upright on a base 2, a movable column 4 which is freely inserted into the fixed column 3 and can be raised and lowered, and a drawing plate frame 5. The movable column 4 or the drawing plate frame 5, one end of the mounting bracket 16 is bent in the drafting table 1 in which the mounting bracket 16 is fixedly installed on one side of the mounting bracket 16 and the drawing board frame 5 is pivotally attached to the movable support column 4 via the mounting bracket 16. The rotation restricting portion 21 is provided, and when the drawing board frame 5 is set at a predetermined angle, the rotation restricting portion 21 contacts the pivotally mounted member of the mounting bracket 16 to restrict the rotation range of the drawing board frame 5. A drawing board frame attachment device for a drafting table, characterized in that it is formed as follows.